U.S. patent number 11,360,343 [Application Number 16/756,130] was granted by the patent office on 2022-06-14 for liquid crystal display module.
This patent grant is currently assigned to WUHAN CHINA STAR OPTOELECTRONICS TECHNOLOGY CO., LTD. The grantee listed for this patent is WUHAN CHINA STAR OPTOELECTRONICS TECHNOLOGY CO., LTD.. Invention is credited to Qi Wei.
United States Patent |
11,360,343 |
Wei |
June 14, 2022 |
Liquid crystal display module
Abstract
A liquid crystal display module includes a display panel and a
backlight module. The display panel includes a first substrate and
a second substrate disposed opposite to each other, a liquid
crystal layer, a first polarizer, and a plurality of fingerprint
recognition units. The first substrate includes filter parts and
light shielding parts. The first polarizer uses a patterned
polarizer. The display panel can realize fingerprint identification
while displaying. The fingerprint recognition unit is provided with
an analyzer unit to avoid crosstalk.
Inventors: |
Wei; Qi (Hubei, CN) |
Applicant: |
Name |
City |
State |
Country |
Type |
WUHAN CHINA STAR OPTOELECTRONICS TECHNOLOGY CO., LTD. |
Hubei |
N/A |
CN |
|
|
Assignee: |
WUHAN CHINA STAR OPTOELECTRONICS
TECHNOLOGY CO., LTD (Hubei, CN)
|
Family
ID: |
1000006370750 |
Appl.
No.: |
16/756,130 |
Filed: |
March 17, 2020 |
PCT
Filed: |
March 17, 2020 |
PCT No.: |
PCT/CN2020/079569 |
371(c)(1),(2),(4) Date: |
April 15, 2020 |
PCT
Pub. No.: |
WO2021/103351 |
PCT
Pub. Date: |
June 03, 2021 |
Prior Publication Data
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|
|
|
Document
Identifier |
Publication Date |
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US 20220004051 A1 |
Jan 6, 2022 |
|
Foreign Application Priority Data
|
|
|
|
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Nov 27, 2019 [CN] |
|
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201911185142.9 |
|
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
G02F
1/133514 (20130101); G02F 1/133512 (20130101); G06V
40/1318 (20220101); G02F 1/13338 (20130101); G02F
1/133528 (20130101); G02F 1/133548 (20210101) |
Current International
Class: |
G02F
1/1335 (20060101); G06V 40/13 (20220101); G02F
1/1333 (20060101) |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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106773229 |
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May 2017 |
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CN |
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110208982 |
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Sep 2019 |
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CN |
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110222620 |
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Sep 2019 |
|
CN |
|
110286512 |
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Sep 2019 |
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CN |
|
110399797 |
|
Nov 2019 |
|
CN |
|
110441944 |
|
Nov 2019 |
|
CN |
|
20160117863 |
|
Oct 2016 |
|
KR |
|
Primary Examiner: Merlin; Jessica M
Attorney, Agent or Firm: Soroker Agmon Nordman
Claims
What is claimed is:
1. A liquid crystal display module, comprising: a display panel;
and a backlight module disposed at a back of the display panel;
wherein the display panel comprises: a first substrate comprising a
plurality of filter parts disposed at intervals and light shielding
parts disposed between at least two adjacent filter parts; a second
substrate disposed opposite to the first substrate; a liquid
crystal layer disposed between the first substrate and the second
substrate; a first polarizer comprising a first area and a second
area, wherein the first area corresponds to the filter parts, the
second area corresponds to the light shielding parts, a
polarization direction of the first area is perpendicular to a
polarization direction of the second area, and the first polarizer
is a metal wire grid polarizer; and a plurality of fingerprint
identification units disposed between the first substrate and the
liquid crystal layer; wherein light emitted by the backlight module
passes through the filter parts to diffusely reflect on a surface
of a touched body and form reflected light, and at least part of
the reflected light passes through the second area and reaches the
fingerprint identification units to form a fingerprint image.
2. The liquid crystal display module according to claim 1, wherein
the display panel further comprises a plurality of analyzer units,
the analyzer unit are disposed between the second area and the
fingerprint recognition unit, the analyzer units correspond to the
fingerprint identification units in one-to-one correspondence;
wherein a polarization direction of the analyzer unit is the same
as the polarization direction of the second area.
3. The liquid crystal display module according to claim 2, wherein
the analyzer unit is disposed on a side of the first substrate
facing the second substrate, and the fingerprint identification
unit is disposed on a side of the analyzer unit near the second
substrate.
4. The liquid crystal display module according to claim 2, wherein
the display panel further comprises a second polarizer, the second
polarizer is disposed on a side of the second substrate facing away
from the first substrate; wherein a polarization direction of the
second polarizer is perpendicular to the polarization direction of
the first area.
5. The liquid crystal display module according to claim 2, wherein
the analyzer unit is disposed on a side of the first substrate
facing the second substrate, and the fingerprint identification
unit is disposed on a side of the analyzer unit near the second
substrate.
6. The liquid crystal display module according to claim 5, wherein
an orthographic projection of the analyzer unit on the first
substrate is located within an orthographic projection of the light
shielding part on the first substrate.
7. The liquid crystal display module according to claim 6, wherein
the light shielding part comprises a black matrix, the black matrix
covers the first substrate corresponding to the light shielding
part, the black matrix is provided with an opening, and the
analyzer unit and the fingerprint recognition unit are located
inside the opening.
8. The liquid crystal display module according to claim 7, wherein
a sum of thicknesses of the analyzer unit, the fingerprint
identification unit, and the liquid crystal layer at a position
corresponding to the opening is equal to a thickness of the liquid
crystal layer at a position corresponding to the filter part.
9. The liquid crystal display module according to claim 1, wherein
the analyzer unit is a metal wire grid polarizer.
10. The liquid crystal display module according to claim 1, wherein
the display panel further comprises a cover plate, the cover plate
is disposed on the first polarizer, and the touched body touches a
side of the cover plate away from the first polarizer.
11. A liquid crystal display module, comprising: a display panel;
and a backlight module disposed at a back of the display panel;
wherein the display panel comprises: a first substrate comprising a
plurality of filter parts disposed at intervals and light shielding
parts disposed between at least two adjacent filter parts; a second
substrate disposed opposite to the first substrate; a liquid
crystal layer disposed between the first substrate and the second
substrate; a first polarizer comprising a first area and a second
area, wherein the first area corresponds to the filter parts, the
second area corresponds to the light shielding parts, a
polarization direction of the first area is perpendicular to a
polarization direction of the second area; and a plurality of
fingerprint identification units disposed between the first
substrate and the liquid crystal layer; wherein light emitted by
the backlight module passes through the filter parts to diffusely
reflect on a surface of a touched body and form reflected light,
and at least part of the reflected light passes through the second
area and reaches the fingerprint identification units to form a
fingerprint image.
12. The liquid crystal display module according to claim 11,
wherein the display panel further comprises a plurality of analyzer
units, the analyzer unit are disposed between the second area and
the fingerprint recognition unit, the analyzer units correspond to
the fingerprint identification units in one-to-one correspondence;
wherein a polarization direction of the analyzer unit is the same
as the polarization direction of the second area.
13. The liquid crystal display module according to claim 12,
wherein the display panel further comprises a second polarizer, the
second polarizer is disposed on a side of the second substrate
facing away from the first substrate; wherein a polarization
direction of the second polarizer is perpendicular to the
polarization direction of the first area.
14. The liquid crystal display module according to claim 12,
wherein the analyzer unit is disposed on a side of the first
substrate facing the second substrate, and the fingerprint
identification unit is disposed on a side of the analyzer unit near
the second substrate.
15. The liquid crystal display module according to claim 14,
wherein an orthographic projection of the analyzer unit on the
first substrate is located within an orthographic projection of the
light shielding part on the first substrate.
16. The liquid crystal display module according to claim 15,
wherein the light shielding part comprises a black matrix, the
black matrix covers the first substrate corresponding to the light
shielding part, the black matrix is provided with an opening, and
the analyzer unit and the fingerprint recognition unit are located
inside the opening.
17. The liquid crystal display module according to claim 16,
wherein a sum of thicknesses of the analyzer unit, the fingerprint
identification unit, and the liquid crystal layer at a position
corresponding to the opening is equal to a thickness of the liquid
crystal layer at a position corresponding to the filter part.
18. The liquid crystal display module according to claim 11,
wherein the analyzer unit is a metal wire grid polarizer.
19. The liquid crystal display module according to claim 11,
wherein an outline of the second area is one of a quadrangle or a
circle.
20. The liquid crystal display module according to claim 11,
wherein the filter part comprises a pixel unit composed of a red
color resist, a green color resist, and a blue color resist.
Description
This application claims the priority of Chinese Application No.
201911185142.9 filed on Nov. 27, 2019 and titled "liquid crystal
display module", which is incorporated herein by reference in its
entirety.
FIELD OF INVENTION
The present disclosure relates to the field of display panel
technologies, and more particularly to a liquid crystal display
module.
BACKGROUND OF INVENTION
With the rapid development of display technologies, display panels
with optical fingerprint recognition have been gradually
popularized in various high-end mobile phones. Compared with liquid
crystal display panels, organic light emitting diode (OLED) display
panels have inherent advantages. Taking a small hole imaging scheme
as an example, a pixel unit in the OLED display panel can be used
as a light emitting source, and emitted light diffusely reflects
through a surface of a touched body (finger) and is received by the
fingerprint recognition unit, thereby forming a fingerprint
image.
However, for the liquid crystal display panel, if it is desired to
realize fingerprint recognition based on the principle of small
hole imaging, it is necessary to perfect part of the structure of
the liquid crystal display panel, otherwise a large part of light
received by the fingerprint recognition unit is interference light,
which will produce serious crosstalk.
In summary, a new liquid crystal display module needs to be
provided to solve the above technical problems.
SUMMARY OF INVENTION
In an embodiment of the present invention provides a liquid crystal
display module, which solves technical problems that a current
liquid crystal display module easily generates serious crosstalk
when implementing fingerprint identification.
To solve the above issues, technical solutions provided by the
present invention are as follows:
An embodiment of the present invention provides a liquid crystal
display module comprising a display panel and a backlight module
disposed at a back of the display panel. The display panel
comprises a first substrate comprising a plurality of filter parts
disposed at intervals and light shielding parts disposed between at
least two adjacent filter parts; a second substrate disposed
opposite to the first substrate; a liquid crystal layer disposed
between the first substrate and the second substrate; a first
polarizer comprising a first area and a second area, wherein the
first area corresponds to the filter parts, the second area
corresponds to the light shielding parts, a polarization direction
of the first area is perpendicular to a polarization direction of
the second area, and the first polarizer is a metal wire grid
polarizer; and a plurality of fingerprint identification units
disposed between the first substrate and the liquid crystal layer.
Light emitted by the backlight module passes through the filter
parts to diffusely reflect on a surface of a touched body and form
reflected light, and at least part of the reflected light passes
through the second area and reaches the fingerprint identification
units to form a fingerprint image.
In an embodiment of the present invention, the display panel
further comprises a plurality of analyzer units, the analyzer unit
are disposed between the second area and the fingerprint
recognition unit, the analyzer units correspond to the fingerprint
identification units in one-to-one correspondence; wherein a
polarization direction of the analyzer unit is the same as the
polarization direction of the second area.
In an embodiment of the present invention, the analyzer unit is
disposed on a side of the first substrate facing the second
substrate, and the fingerprint identification unit is disposed on a
side of the analyzer unit near the second substrate.
In an embodiment of the present invention, the display panel
further comprises a second polarizer, the second polarizer is
disposed on a side of the second substrate facing away from the
first substrate; wherein a polarization direction of the second
polarizer is perpendicular to the polarization direction of the
first area.
In an embodiment of the present invention, the analyzer unit is
disposed on a side of the first substrate facing the second
substrate, and the fingerprint identification unit is disposed on a
side of the analyzer unit near the second substrate.
In an embodiment of the present invention, an orthographic
projection of the analyzer unit on the first substrate is located
within an orthographic projection of the light shielding part on
the first substrate.
In an embodiment of the present invention, the light shielding part
comprises a black matrix, the black matrix covers the first
substrate corresponding to the light shielding part, the black
matrix is provided with an opening, and the analyzer unit and the
fingerprint recognition unit are located inside the opening.
In an embodiment of the present invention, a sum of thicknesses of
the analyzer unit, the fingerprint identification unit, and the
liquid crystal layer at a position corresponding to the opening is
equal to a thickness of the liquid crystal layer at a position
corresponding to the filter part.
In an embodiment of the present invention, the analyzer unit is a
metal wire grid polarizer.
In an embodiment of the present invention, the display panel
further comprises a cover plate, the cover plate is disposed on the
first polarizer, and the touched body touches a side of the cover
plate away from the first polarizer.
An embodiment of the present invention further provides a liquid
crystal display module comprising a display panel and a backlight
module disposed at a back of the display panel. The display panel
comprises a first substrate comprising a plurality of filter parts
disposed at intervals and light shielding parts disposed between at
least two adjacent filter parts; a second substrate disposed
opposite to the first substrate; a liquid crystal layer disposed
between the first substrate and the second substrate; a first
polarizer comprising a first area and a second area, wherein the
first area corresponds to the filter parts, the second area
corresponds to the light shielding parts, a polarization direction
of the first area is perpendicular to a polarization direction of
the second area; and a plurality of fingerprint identification
units disposed between the first substrate and the liquid crystal
layer. Light emitted by the backlight module passes through the
filter parts to diffusely reflect on a surface of a touched body
and form reflected light, and at least part of the reflected light
passes through the second area and reaches the fingerprint
identification units to form a fingerprint image.
In an embodiment of the present invention, the display panel
further comprises a plurality of analyzer units, the analyzer unit
are disposed between the second area and the fingerprint
recognition unit, the analyzer units correspond to the fingerprint
identification units in one-to-one correspondence; wherein a
polarization direction of the analyzer unit is the same as the
polarization direction of the second area.
In an embodiment of the present invention, the display panel
further comprises a second polarizer, the second polarizer is
disposed on a side of the second substrate facing away from the
first substrate; wherein a polarization direction of the second
polarizer is perpendicular to the polarization direction of the
first area.
In an embodiment of the present invention, the analyzer unit is
disposed on a side of the first substrate facing the second
substrate, and the fingerprint identification unit is disposed on a
side of the analyzer unit near the second substrate.
In an embodiment of the present invention, an orthographic
projection of the analyzer unit on the first substrate is located
within an orthographic projection of the light shielding part on
the first substrate.
In an embodiment of the present invention, the light shielding part
comprises a black matrix, the black matrix covers the first
substrate corresponding to the light shielding part, the black
matrix is provided with an opening, and the analyzer unit and the
fingerprint recognition unit are located inside the opening.
In an embodiment of the present invention, a sum of thicknesses of
the analyzer unit, the fingerprint identification unit, and the
liquid crystal layer at a position corresponding to the opening is
equal to a thickness of the liquid crystal layer at a position
corresponding to the filter part.
In an embodiment of the present invention, the analyzer unit is a
metal wire grid polarizer.
In an embodiment of the present invention, an outline of the second
area is one of a quadrangle or a circle.
In an embodiment of the present invention, the filter part
comprises a pixel unit composed of a red color resist, a green
color resist, and a blue color resist.
Beneficial Effect
Beneficial effect of embodiments of the present invention: The
liquid crystal display module provided by embodiments of the
present invention is formed by diffusely reflecting light emitted
from the backlight module through the filter part by the touched
body. At least part of the light is recognized and received by the
fingerprint recognition unit, and fingerprint recognition can be
realized while displaying. In addition, the first polarizer uses a
patterned polarizer to separate the light with fingerprint
recognition from other interference light. The fingerprint
recognition unit is provided with an analyzer unit, so that the
fingerprint recognition unit can only receive light with
fingerprint identification information. Disturbing light in other
directions is absorbed by the analyzer unit and cannot reach the
fingerprint recognition unit, thereby avoiding crosstalk.
DESCRIPTION OF DRAWINGS
In order to explain the technical solution in the embodiments or
the prior art more clearly, the accompanying drawings used in the
description of the embodiments or the prior art will be briefly
introduced below. Obviously, the drawings in the following
description are only some embodiments of the present invention. For
those of ordinary skill in the art, other drawings can be obtained
according to the drawings without paying creative efforts.
FIG. 1 is a schematic cross sectional diagram of a first liquid
crystal display module according to an embodiment of the present
invention.
FIG. 2 is a schematic plan view of a first polarizer according to
an embodiment of the present invention.
FIG. 3 is a schematic diagram of positions of openings on a black
matrix according to an embodiment of the present invention.
FIG. 4 is a schematic cross sectional diagram of a second liquid
crystal display module according to an embodiment of the present
invention.
FIG. 5 is a schematic diagram of reflected light propagation
according to an embodiment of the present invention.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
The following descriptions of the embodiments are made with
reference to additional illustrations to illustrate specific
embodiments in which the present invention can be implemented. The
directional terms mentioned in the present invention, such as up,
down, front, back, left, right, inside, outside, side, etc., are
only directions referring to the accompanying drawings. Therefore,
the directional terms used are for explaining and understanding the
present invention, but not for limiting the present invention. In
the figures, similarly structured units are denoted by the same
reference numerals.
For a liquid crystal display module of the prior art, when
fingerprint recognition is realized, serious crosstalk is easy to
occur, and an embodiment of the present invention can solve the
defect.
As shown in FIG. 1, a liquid crystal display module provided by an
embodiment of the present invention includes a display panel 1 and
a backlight module 2 disposed at a back of the display panel 1. A
part of light emitted by the backlight module 2 is used to realize
image display, and another part of the light is used as a
fingerprint identification light source. The display panel 1
includes a first substrate 11, a second substrate 12, a liquid
crystal layer 13, a first polarizer 14, and a plurality of
fingerprint recognition units 15. The first substrate 11 and the
second substrate 12 are oppositely arranged. The liquid crystal
layer 13 is located between the first substrate 11 and the second
substrate 12. The fingerprint identification units 15 are disposed
between the first substrate 11 and the liquid crystal layer 13 and
are configured to receive the reflected light formed by diffuse
reflection on a surface of a touched body (such as a finger) and
perform fingerprint recognition based on the reflected light.
It should be noted that in an embodiment of the present invention,
the first substrate 11 is a color filter substrate, and the second
substrate 12 is an array substrate.
Specifically, the first substrate 11 includes a plurality of filter
parts 16 disposed at intervals and light shielding parts 17
disposed between at least two adjacent filter parts 16. The filter
parts 16 are configured to filter light emitted by the backlight
module 2 to form red, yellow, and blue primary colors. The light
shielding parts 17 are configured to avoid crosstalk of light. Each
of the filter parts 16 includes a color resist unit, which is
composed of a red color resist R, a green color resist G, and a
blue color resist B. It is understood that, the color resist unit
may also be composed of a red color resist R, a green color resist
G, a blue color resist B, and a white color resist W, which should
not be limited in the embodiments of the present invention.
The first polarizer 14 includes a first area 141 and a second area
142. The first area 141 corresponds to the filter parts 16. The
second area 142 corresponds to the light shielding parts 17. A
polarization direction of the first area 141 is perpendicular to a
polarization direction of the second area 142. Therefore, after
light emitted by the backlight module 2 passes through the filter
parts 16, diffuse reflection occurs on a surface of a touched body
to form reflected light. The reflected light within a certain
angular range above the second area 142 at least partially passes
through the second area 142 and is received by the fingerprint
identification unit 15 as fingerprint identification light to form
a fingerprint image. The reflected light outside the angle range
passes through the first area 141, which is essentially
interference light that easily causes crosstalk to the fingerprint
recognition. The fingerprint identification light and the
interference light respectively form polarized light after passing
through the second area 142 and the first area 141, and the
polarization directions of the two are different, thereby
separating the fingerprint identification light and the
interference light.
Specifically, compared to a conventional polarizer, the first
polarizer 14 may use a patterned polarizer. That is, the second
area 142 is patterned so that the polarization direction of the
first area 141 is perpendicular. The first polarizer 14 may also
use a conventional polarizer, and a phase retardation film is
provided on the first polarizer 14. The phase retardation film
includes a non-delay part and a delay part. The non-delayed part
corresponds to the first area 141, and reflected light passes
through the first area 141 without phase delay. The delay part
corresponds to the second area 142, and phase delay amount of the
delay part is 1/2.lamda.. Phase delay of the reflected light
passing through the second area 142 causes a polarization direction
of the reflected light after exiting the second area 142 to be
perpendicular to a polarization direction of the reflected light
before entering the second area 142.
Specifically, as shown in FIG. 2, which is a schematic plan view of
the first polarizer 14, an outline of the second area 142 may be
one of a quadrangle or a circle.
Referring again to FIG. 1, the display panel 1 further includes a
plurality of analyzer units 18. Each of the analyzer units 18 is
located between the second area 142 and the fingerprint
identification unit 15. The analyzer units 18 correspond to the
fingerprint identification units 15 in one-to-one correspondence.
Reflected light needs to pass through the analyzer unit 18 before
being received by the fingerprint identification unit 15 to check
whether the reflected light passing through the analyzer unit 18 is
fingerprint identification light. Specifically, a polarization
direction of the analyzer unit 18 is the same as the polarization
direction of the second area 142. This causes the fingerprint
recognition light to pass through the analyzer unit 18 and be
received by the fingerprint recognition unit 15.
Further, the polarization direction of the first area 141 is
perpendicular to the polarization direction of the analyzer unit
18. Disturbing light passing through the first area 141 is absorbed
by the analyzer unit 18 and thus cannot be received by the
fingerprint identification unit 15. This avoids crosstalk caused by
interference light to the fingerprint recognition light and avoids
affecting accuracy of fingerprint recognition. Even the
interference light transmitted from the adjacent second area 142
has an excessively large angle and a small energy, and its
interference is not strong. In addition, a distance between the two
adjacent fingerprint recognition units 15 can be adjusted to
improve and avoid influence of the interference light on
fingerprint recognition.
The display panel 1 further includes a second polarizer 19. The
second polarizer 19 is disposed on a side of the second substrate
12 facing away from the first substrate 11. A polarization
direction of the second polarizer 19 and the polarization direction
of the first area 141 are perpendicular to each other. Liquid
crystal molecules in the liquid crystal layer 13 have optical
rotation characteristics for polarized light, when a voltage is
applied to the display panel 1, an arrangement direction of the
liquid crystal molecules rotates under control of an electric
field. Therefore, light emitted by the backlight module 2 passes
through the second polarizer 19 and the liquid crystal layer 13 in
order, and then exits from the first area 141 of the first
polarizer 14, thereby realizing a normal display function.
It can be understood that a propagation order of light emitted by
the backlight module 2 is that: the light emitted by the backlight
module 2 passes through the second polarizer 19, the second
substrate 12, the liquid crystal layer 13, the filter part 16, the
first substrate 11, and the first area 141 in sequence. A part of
the light is emitted from the display panel 1 to realize a normal
display function. Another part of the light is diffusely reflected
on the surface of the touched body to form reflected light. After
the reflected light passes through the second area 142, the first
substrate 11, and the analyzer unit 18 in sequence, the reflected
light is received by the fingerprint recognition unit 15 to
generate a fingerprint image to realize a fingerprint recognition
function.
The analyzer unit 18 is located on a side of the first substrate 11
facing the second substrate 12, and the fingerprint identification
unit 15 is located on a side of the analyzer unit 18 near the
second substrate 12.
An orthographic projection of the analyzer unit 18 on the first
substrate 11 is located in a orthographic projection of the light
shielding part 17 on the first substrate 11 to prevent the light
emitted by the backlight module 2 from sequentially passing through
the filter part 16 and the analyzer unit 18 when propagating
upward.
Specifically, the light shielding part 17 includes a black matrix
171. The black matrix 171 covers the first substrate 11 of the
light shielding part 17. The black matrix 171 is provided with an
opening 172. The analyzer unit 18 and the fingerprint
identification unit 15 are located in the opening 172. On one hand,
the polarization direction of the analyzer unit 18 and the
polarization direction of the second polarizer 19 are the same.
Therefore, when the light emitted from the backlight module 2
propagates upward, it is absorbed by the analyzer unit 18. The
analyzer unit 18 is the same as the black matrix 171 and can also
play a role in shielding light. On another hand, it is possible to
save space occupied by the analyzer unit 18 and the fingerprint
recognition unit 15 and reduce a thickness of the display panel
1.
FIG. 3 is a schematic diagram of positions of openings 172 on the
black matrix 171. In an embodiment of the invention, the openings
172 are arranged in a horizontal and vertical array. A period of
the openings 172 may be the same as a period of the color resist
unit or may be different from the period of the color resist
unit.
Further, FIG. 4 is a schematic cross sectional diagram of a second
liquid crystal display module according to an embodiment of the
present invention. Compared with the first type liquid crystal
display module shown in FIG. 1, FIG. 4 is different in that: a
width of the analyzer unit 18 and a width of the light shielding
part 17 are same, so that the black matrix 171 can be eliminated.
Because the width of the analyzer unit 18 is larger, a range in
which the reflected light enters the analyzer unit 18 is increased.
Space for placing the fingerprint recognition unit 15 becomes
larger. In addition, it is advantageous to increase a circuit
placement space associated with the fingerprint identification unit
15.
Further, a sum of thicknesses of the analyzer unit 18, the
fingerprint identification unit 15, and the liquid crystal layer 13
at a position corresponding to the opening 172 is equal to a
thickness of the liquid crystal layer 13 at a position
corresponding to the filter part 16. This ensures that the first
substrate 11 and the second substrate 12 have the same cell
thickness at each position.
In an embodiment of the present invention, the analyzer unit 18 is
a metal wire grid polarizer. Similarly, the first polarizer 14 and
the second polarizer 19 are also metal wire grid polarizers.
The display panel 1 further includes a cover plate 20. The cover
plate 20 is located on the first polarizer 14. The cover plate 20
is transparent glass. The touched body touches a side of the cover
plate 20 away from the first polarizer 14.
As shown in FIG. 5, an angle range at which each fingerprint
recognition unit 15 can receive reflected light is set to .theta.,
then tan(.theta./2)=(S1+S2)/H2. Each of the fingerprint recognition
units 15 can cover a width of a touched body area
D=(S1+S2)+2*H1*tan(.theta./2). S1 is a width of the second area
142, S2 is a width of the analyzer unit 18, H1 is a thickness of
the cover plate 20, and H2 is a thickness of the first substrate
11.
It can be understood that the angle range .theta. of the reflected
light covered by each fingerprint recognition unit 15, the width S1
of the second area 142, the width S2 of the analyzer unit 18, and
the thickness H2 of the first substrate 11 are related. The width D
of the touched body area covered by each fingerprint recognition
unit 15, the width S1 of the second area 142, the width S2 of the
analyzer unit 18, the thickness H1 of the cover plate 20, and the
thickness H2 of the first substrate 11 are related. Therefore, each
fingerprint recognition unit 15 can receive the angle range .theta.
of reflected light and each fingerprint recognition unit 15 can
cover the width D of the touched body area, and the above
parameters can be adjusted according to actual conditions.
Beneficial effect of embodiments of the present invention: The
liquid crystal display module provided by embodiments of the
present invention is formed by diffusely reflecting light emitted
from the backlight module through the filter part by the touched
body. At least part of the light is recognized and received by the
fingerprint recognition unit, and fingerprint recognition can be
realized while displaying. In addition, the first polarizer uses a
patterned polarizer to separate the light with fingerprint
recognition from other interference light. The fingerprint
recognition unit is provided with an analyzer unit, so that the
fingerprint recognition unit can only receive light with
fingerprint identification information. Disturbing light in other
directions is absorbed by the analyzer unit and cannot reach the
fingerprint recognition unit, thereby avoiding crosstalk.
In summary, although the present invention has been disclosed as
above with preferred embodiments, the above preferred embodiments
are not intended to limit the present invention. Those skilled in
the art can make various modifications and retouching without
departing from the spirit and scope of the present invention.
Therefore, the protection scope of the present invention is subject
to the scope defined by the claims.
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